No abstract available

[en] The Central Solenoid (C S) of ITER (International Thermonuclear Experimental Reactor) is designed to operate at 13 T, 0.5 - 1 T s, 5.8 K. There is an experimental evidence that reduced performances in variable field, not explained by A C losses, could occur in CIC (cable-in-conduit) conductors. Such ramp rate limitations have to be well understood in order to be avoided in the ITER conductors. In the ENEA (National Agency for New Technology, Energy and Environment) Frascati Laboratory a facility has been assembled to test in pulsed regimes (up to 8 T, 4 T / s, 12 K) the ENEA (National Agency for New Technology, Energy and Environment) Nb₃ Sn CICC coil. The characteristics of the coil (dimensions, CIC conductor, strand designed for use in variable field). Main objectives of the program are experimental data on ramp rate limitations, pulsed-current distribution in the cable, limiting currents and global A C losses. This paper reports the results of the measurements carried out up now, and those of the simulations performed by means of the thermo-hydraulic analysis code SARUMAN

[en] As the present NET specifications call for a toroidal magnetic field of about 5 T on the plasma axis the geometry of the TF coils system will require a maximum magnetic field on the conductor of about 11 T. A superconducting magnet system fulfilling these conditions can be designed on the basis of the present technology choosing one of the two following solutions: 1) a Nb-Ti conductor cooled by means of pressurized superfluid helium at 1.8 K; 2) an A-15 based conductor cooled by liquid Helium at temperatures around 4.5 K

[en] A dedicated facility prepared by ENEA (Italian Agency for Energy and Environment) for the cryogenic testing of by-pass diodes for the protection of the CERN Large Hadron Collider main magnets will be described. This experimental activity is in the frame of a contract awarded to OCEM, an Italian firm active in the field of electronic devices and power supplies, in collaboration with ENEA, for the manufacture and testing of all the diode stacks. In particular, CERN requests the measurement of the reverse and forward voltage diode characteristics at 300 K and 77 K, and endurance test cycles at liquid helium temperature. The experimental set-up at ENEA and data acquisition system developed for the scope will be described and the test results reported